Hi novostroy
The text 'Hi Username' belongs to JA Login module, you can find this text in language file of this module:
/language/en-GB/en-GB.mod_jalogin.ini
About the social icons, it's a custom HTML module in 'topbar-right' position, you should disable default editor in Global configuration first, then edit icons in this module:
<ul class="social-list">
<li><a href="/index.php" title="facebook"><i class="fa fa-facebook" aria-hidden="true"></i></a></li>
<li><a href="/index.php" title="twitter"><i class="fa fa-twitter" aria-hidden="true"></i></a></li>
<li><a href="/index.php" title="vimeo"><i class="fa fa-vimeo" aria-hidden="true"></i></a></li>
<li><a href="/index.php" title="rss"><i class="fa fa-rss" aria-hidden="true"></i></a></li>
</ul>
In the filter form, you can find those language constants in language file of JA Megafilter component:
/language/en-GB/en-GB.com_jamegafilter.ini
COM_JAMEGAFILTER_ENTER_SEARCH="Enter"
COM_JAMEGAFILTER_MIN="Min:"
COM_JAMEGAFILTER_MAX="Max:"
....
The below text is from language file of template:
/language/en-GB/en-GB.tpl_ja_property.ini
TPL_TRY_SEARCH = "Not enough for you? Don't worry. Let’s try"
TPL_ADVANCED_SEARCH = "Advanced Search"
TPL_CLOSE_ADVANCED_SEARCH = "Close Advanced Search"